Description
* Size: 32X20X22mm/1.25*0.78*0.86”* The main chip: MQ135 gas sensing probe
* Operating voltage: DC 5V
* Power (current) : 150mA
* DO Output: 0.1V/5V
* AO Output: 0.1-0.3V
* Signal output indicator instructions
* Dual signal output (analog output, and TTL level output)
* TTL output valid signal is low; (output low signal light, which can be accessed microcontroller IO port)